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Verify: (sin x + sin y)/ (cos x + cos y) = tan((x+y/2))?

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  • Verify: (sin x + sin y)/ (cos x + cos y) = tan((x+y/2))?


Answers

... x+y)/2)*cos((x-y)/2) cos(x)-cos(y) = -2*sin((x+y)/2)*sin((x-y)/2) tan(x)+tan(y ... y) = (cos(x-y)+cos(x+y))/2 sin(x)*cos(y) = (sin(x-y)+sin(x+y))/2 sin ...
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Positive: 93 %
Trigonometric Functions of Acute Angles sin X = opp / hyp = a / c , csc X = hyp / opp = c / a tan X = opp / adj = a / b , cot X = adj / opp = b / a
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Positive: 90 %

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Positive: 88 %
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... = sin(x)cos(y) + cos(x)sin(y) It is ... not the multiplicative inverse of sin(x).) By observing the graphs of sine and cosine, ... , sin 2 (x) + cos 2 ...
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Positive: 51 %

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